Nested Interface in Java

An interface can have another interface which is known as a nested interface.

$\begin{lstlisting} interface printable{ void print(); interface MessagePrintable{ void msg(); } } \end{lstlisting}$

Example of nested interface which is declared within the interface

$\begin{lstlisting} interface Showable{ void show(); interface Message{ voi... ...estNestedInterface1();//upcasting here message.msg(); } } \end{lstlisting}$

Output:

$\begin{lstlisting} hello nested interface \end{lstlisting}$

Let's see how we can define an interface inside the class and how we can access it. Below program is the example for nested interface which is declared within the class.

$\begin{lstlisting} class A{ interface Message{ void msg(); } } \par clas... ...estNestedInterface2();//upcasting here message.msg(); } } \end{lstlisting}$

Output:

$\begin{lstlisting} hello nested interface \end{lstlisting}$